Definitely do not tie 0VDC to ground. It will often cause problems with the
switching power supply.
On 13 July 2018 at 04:55, Dave Cole wrote:
> Typically in a multi-panel control system setup there is a ground bar in
> each panel. The incoming AC power ground is tied to this and the 24
On 12.07.18 15:33, John Dammeyer wrote:
> So what happens when the equipment with the 24V supply is 30m long in
> multiple steel frames? There would be a bonding wire from frame to
> frame since you wouldn't want to bond one end to one AC ground outlet
> and the other end to a different AC ground
Typically in a multi-panel control system setup there is a ground bar in
each panel. The incoming AC power ground is tied to this and the 24
volt power supply negative is tied to the local ground bar just as I
described before. If all of these panels are on a common machine frame,
the
On Thursday 12 July 2018 17:31:17 andy pugh wrote:
> On 12 July 2018 at 20:12, John Dammeyer wrote:
> > Is it standard practice to connect the DC Servo and DC
> > Instrumentation Bus to the machine frame ground which is connected
> > to power line earth? Or is it more normal practice to keep
So what happens when the equipment with the 24V supply is 30m long in multiple
steel frames? There would be a bonding wire from frame to frame since you
wouldn't want to bond one end to one AC ground outlet and the other end to a
different AC ground outlet.
What if you have 30A, 24V supplies
Agreed, I have never seen a high voltage DC drive bus leg connected to
ground. That could cause all kinds of problems!
Dave
On 7/12/2018 5:31 PM, andy pugh wrote:
On 12 July 2018 at 20:12, John Dammeyer wrote:
Is it standard practice to connect the DC Servo and DC Instrumentation Bus
to
I think you need to define what you mean by "grounding".
If you have a 24 volt DC powered control system, like an industrial
control panel, typically the 24 volt DC power supply/s will tie the 0V
terminal on the power supply to frame/panel ground. These are the big
10, 20, 40 amp 24 volt DC
On 12 July 2018 at 20:12, John Dammeyer wrote:
> Is it standard practice to connect the DC Servo and DC Instrumentation Bus
> to the machine frame ground which is connected to power line earth? Or is
> it more normal practice to keep the DC isolated from the 'earth' ground.
I think it might be
HI Dave,
The problem comes in when some devices ground the DC to the frame internally.
I don't see an issue with grounding the DC bus bar to earth ground at one
point.
I'm just looking at "standard practices" which all suggest no connection or at
only one spot.
Thanks
John
> -Original
I think I done a poor job of explaining my question, although I believe Andy
Pugh got it. I created a video demonstrating what I mean, although not the
great. Was wondering if someone would correct my mis-information or confirm
what I think to be true. If I am correct, can we get it changed in
Thanks,
I'm not concerned about the AC ground side of things.
Internet searches on this subject generally seem to agree that DC ground
doesn't and shouldn't be connected to the metal frame earth ground at any
point. If it is either through a capacitor or a 100 ohm resistor.
I remember many
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On Wed, Jul 11, 2018 at 3:32 PM Eric Keller wrote:
>
Normally, a single ground point is established in the cabinet and all of
the grounds tie to that one point.
The same point is also tied power line ground.
The multi hole bus bars they sell for use in a AC power breaker boxes
work well for this.
Every big box home store will have a selection
On Thursday 12 July 2018 15:12:40 John Dammeyer wrote:
> Is it standard practice to connect the DC Servo and DC Instrumentation
> Bus to the machine frame ground which is connected to power line
> earth? Or is it more normal practice to keep the DC isolated from the
> 'earth' ground.
>
> John
Is it standard practice to connect the DC Servo and DC Instrumentation Bus
to the machine frame ground which is connected to power line earth? Or is
it more normal practice to keep the DC isolated from the 'earth' ground.
John
On Thu, 12 Jul 2018, Les Newell wrote:
Date: Thu, 12 Jul 2018 16:21:42 +0100
From: Les Newell
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] 7i92 bitfile programming problem
I am trying to program a 7i92 using Mesaflash and I am
I am trying to program a 7i92 using Mesaflash and I am having a problem:
mesaflash --device 7i92 --write 7i92_G540x2D.bit
Error: wrong bitfile destination device: 6slx9tqg144, should be xc6slx9
Looking at the board it does appear to have an xc6slx9. Has the 7i92
been redesigned recently? If
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